Stupid Cashier & Watson

Went to sungai wang watson 2 buy smt. I saw the body acne wash tat i m using is having promotion at only rm 19.90. The original price is rm 28.90. Then i took 2 boxes of eclispe at at only rm 9.80. The original price is rm 5.50 each.
After tat i straight go n pay at the cashier. Then the cashier saw i took 2 eclispe then she asked her collegue "hey, ini tak ada promotion lagi, betul tak?" I just heard tis sentence n the following conversation they hav i hardly hear it. After the conversation she scan the price n the price is rm 11.

Me : Huh??
Cashier : The price was yesterday's price. Our promotion til yesterday.
Me: But ur price tag stil showing rm 9.80 for 2.
Cashier : Ya, i know but the problem is v dun hav time 2 change it.
Me : Then is ur mistake. U shud tell me b4 u scan the product.
Cashier : If u 1 rm 9.80 for two i can giv it 2 u.
Me : NO. I dun need it.
Cashier : Then u just 1 tis body wash?
Me : Yes.

Then the same problem occured again. The price wasn't same as the price tat they hav written on the cardboard.
Me : Har??
Cashier : I edi told u the price was yesterday's price.
Me : ....
Cashier : Then do u stil need it?
Me : NO!! I dun1.

Wat a stupid cashier n wat stupid watson management. I m not ur staff how m i gonna know the price was yesterday's price? N stupid cashier u din mention every products tat having promotion was yesterday's price la. There r so many products there. N the most important thing is there r no original price tag on the product itself. There is just the promotional price tat written on the cardbboard. No doubt ppl will look at the only price tag wat. N is ur own business u dun hav time 2 change ur price. U shud sell ur product as the price shown. Stupid watson u shud get ready 4 everything b4 opening ur business. Is an very lousy excuse tat u dun hav enough time 2 get ready. STUPID STUPID STUPID!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Some more the cashier stil 1 2 show me the "black face". Relly angry wit her.